I need help diagnosing an issue with my ’98 900ES. Current symptoms: I can drive it about 15-20 miles then it will rev up and down by itself a few times and will stop running. If I let it set for a few hours, it will run again and to drive it 15- 20 miles again. If I drive less than 10 miles or so and turn the engine off, and try to start it after a few minutes, it will be hard to start again, exhibiting the same symptoms – revving up and down and then dying. Here’s a little history…A few weeks ago it died while I was out to lunch. Prior to this, I did not have any issues with the car running correctly. I towed to the local Saab shop who diagnosed the issue as a fuel pump. They also said that I had a faulty fuel tank ( via a smoke test), an intermittent misfire due to the DI Cassette and a very small leak in the head gasket. Bottom line was a lot more to fix it than the car is worth. I removed the fuel tank and replaced the fuel pump but broke the return fitting and had to replace it. I wasn’t sure how to replace the hard plastic hose attached to the fuel pump so I used rubber gas line hose. Is it possible that too much pressure is building in this hose, causing it to leak? I still have my old hard plastic return hose that I can use instead of the rubber hose but I don’t know how these are fitted. Are they heat-shrinked? Also, when I removed the gas tank, I noticed that the vent hose was split. I think this is where the shop surmised that the gas tank had a bad weld. I fixed the split hose and bolted everything back. It runs good if it has been setting for a few hours but gets worse the more I drive it until it eventually stops. Any insights would be greatly appreciated.